Mixing valve



R. A. J. EVANS Y l MIXING VALVE Dec. 21, 1937.

J Filed March 17, 1957 xNvENToR RiczarfdJEvcn BY E ATTORNEYS/ carburation is secured ingjparts.

Patented Dec. 21, 1937 UNITED? sm'rss ieArsN'r `orties v-,olaiims This invention relates to mixing' valves 'for oil and gasl burners, and hasfor an object to provide an improved' construction wherein a maximum Another object' of the invention is to provide aA mixing valve wherein means are provided for producing a plurality-of independent carburating or mixing actions.

A further and more'specic object is to provide a mixing valve havinga plurality of aligned mixing structures with various. means for injecting air at diierent points so that there lwill be a preliminary mixing ofgoil or gas and air,then a second mixing, and if desired a nal mixing of additional airwith the previous mixture.

In the accompanying drawing:

Fig. 1 is a longitudinal vertical sectional view through a valve disclosing an embodiment ofthe invention; Y

Fig. 2 is a transversesectional view through Fig. 1 approximately on 'the line 2 2.;

Fig. 3 is a transverse sectional View through Fig. 1 approximately on the line.33.

Referring to the accompanying drawing by numerals, I indicates a cylinder or casing which is shown in a vertical position asY it may be used inv this position or in a horizontal position, as pre- Aferred. The casing I is provided with a restricted discharge or outlet opening2 and With a full inlet opening 3. The casing at opening 3 is provided with a flaring flange 4 on which a shutter 5 is secured. Shutter 5 is adapted to be rotated or rocked back and forth to vary the various shutter openings 6 and `thereby vary the entrance of air into the primary inlet chamber l. The shutter 5 preferably supports an inlet jet 8 adapted to be connected with a suitable source of fluid fuel by a suitable pipe 9. The fuel may be gas or oil and the supply may be increased or decreased, as desired.

The jet 8 has a small discharge opening I Il which discharges with some force directly into the primary mixing chamber II. This chamber together with associated parts form a mixing structure having a tubular body I2 with what may be termed an apertured closed end I3. The aperture I4 is somewhat larger than the aperture I0 and is in line therewith. At the open end of the tubular member I2 there is provided a radiating flange I5 that tightly engages the side walls or cylinder of casing I and is preferably held in place by friction, although it could be welded or otherwise secured to the casing. Opposite substantially the centralpoint of body I 2 are a numwithout the use ofnovber of auxiliary air inlet apertures or openings I6. A hollow band I 'I surrounds the casing I and encloses the openings I6. An air supply pipe I8 is connected with the band II'so that air froma pump or other suitable source of `compressed air may be directed into the interior of band I'I' and thence through the openings I6 into the secondary air .inlet chamber I9. The secondary mixing structure 2B is arranged in line with the mixing.

structure I I and is provided with a tubularmember 2l. having a mixing chamber '22A provided with an outlet 23 somewhat larger than the outlet I4.

The tubular body 2| is provided with a radiating flange 24 which is formed with a number of notches or cutaway parts 25 at the periphery so as to allow air from chamber I9 to enter the chamber 26. The flange 24 tightly ts the cylinder or casing I and may be welded thereto, lif desired. It will be noted from Fig. 1 that the outlet or discharge openingv 23 discharges directly into and through the outlet opening 2 and' by reason of the atomizingrefect draws air from` chamber 26 so that this last air will mix with the previous mixture as it passes through the outlet` 2. It will be noted that in chambers 'I and, II there will be4 produced a preliminary mixing of air and fuel. `In the upper part of chamber. I9A

and in chamber 2| there will be an added mixing.y

of new air with the previous mixture. The mixture passing through the opening 23 will be further rmixed with Yadditional air from chamber 26.V

All this mixing action is done more or less through an atomizing principle whereby there will be a maximum mixing or Carburation so that a maximum amount of airl will be burned with the fuel. This will naturally produce a better: combustion of the fuel and consequently a greater eiciency in the burner using .the mixing valve as disclosed in Fig. 1.

Under some circumstances, as for instance when oil is fed into the mixing valve under pressure it may not be necessary to use compressed air, and when this is true the pipe I8 is removed and air is drawn in through openings I6 from the surrounding atmosphere. It will be understood that the Valve may be connected up to various kinds of burners without departing from the spirit of the invention, and consequently may eiciently use the fuel.

I claim: v

1. An air mixing valve for oil and gas burners comprising a cylinder having a plurality of openings intermediate its length, a full opening at one end and a restricted opening at the opposite end, an oil j et extending into said cylinder through said full open end adapted to discharge fuel under pressure, an air regulating shutter at said full open end for regulating the entrance of air around said jet, a primary mixing structure having a jet positioned in said cylinder and in line with said oil jet for receiving oil and air, said primary mixing structure having a discharge opening at the end opposite said oil jet of a size smaller than the area covered by the fuel from said oil jet, and an auxiliary mixing structure having a jet in said cylinder spaced from said primary mixing structure, said auxiliary mixing structure having a discharge opening of less diameter than the area covered by the mixture discharged from the primary mixing structure, said opening being positioned to discharge through said restricted opening, said cylinder having air inlets intermediate its length for supplying said auxiliary mixing structure with air.

2. A valve of the character described including a cylinder open at both ends, an air shutter at one end of said cylinder, means forming a restricted opening at the other end, a pair of aligned mixing chambers having jets arranged in tandem in said cylinder, one of said mixing chambers being positioned to receive air through said shutter, said cylinder intermediate its ends having apertures for supplying air to the other mixing chamber, and a fuel inlet jet extending through said shutter for discharging fuel into the first mixing chamber, the second mixing chamber discharging a combustible mixture through said restricted opening, said mixing chamber having an air by-pass for directing air into said combustible mixture as it enters said restricted opening.

3. A valve of the character described comprising a cylinder having a large opening at one end, a small opening at the opposite end and a plurality of openings intermediate the ends, means in said cylinder forming a mixing chamber on each side of the opening intermediate the length of the cylinder, each of said means having a tubular body fully open at one end and almost closed at the opposite end, said fully open end having a radially extending flange having its periphery snugly fitting against said cylinder, a fuel inlet jet positioned to project fuel into the mixing chamber nearest the large opening of the cylinder, and an air shutter at said large opening for regulating the entrance of. air therein.

4. A valve of the character described comprising a cylinder open at both ends and provided substantially midway between the ends with an air auxiliary inlet opening, means for discharg- ,ing fluid fuel into said cylinder under pressure through one end, a plurality of groups of tubular means having large inlet ends and restricted outlet ends, said groups of tubular means being positioned in said cylinder between the ends thereof for mixing air with said fuel whereby the fuel leaving the cylinder will be carburated, and an air regulating shutter at one end of said cylinder.

5. A valve of the character described comprising a casing having a plurality of auxiliary air inlet openings substantially centrally thereof, a large primary air inlet opening at one end and an outlet opening at the opposite end, a hollow band surrounding said casing and positioned over said auxiliary air inlet openings, means for directing air under pressure into said hollow band, said air being adapted to pass from said hollow band through said auxiliary openings into said casing, means for directing a fluid fuel into said casing through said large primary air inlet opening, mixing means adjacent said large opening for mixing air passing through said large opening and said fuel, and means adjacent said outlet opening for receiving the mixed air and fuel from said mixing means and mixing the same with air from said auxiliary air inlet openings, said last mentioned means discharging through said outlet opening. Y

6l A valve of the character described comprising a tubular casing having a restricted outlet at one end and an unrestricted inlet at the opposite end, said casing also having an auxiliary air inlet opening substantially centrally thereof, means for directing a fluid fuel under pressure into said casing through said inlet end, mixing means for mixing air passing through said inlet end and said fuel, and secondary mixing means for receiving the mixed air and fuel from the first mentioned mixing means and mixing the same with air entering through said auxiliary air inlet opening, said secondary mixing; means discharging through said outlet opening, said secondary mixing means being provided With air by-passes for directing air from said auxiliary air inlet to said restricted outlet for giving a third mixing of the fuel with air before it is discharged.

7. A valve of the character described including a cylinder having an auxiliary air inlet substantially midway of its length, a primary air inlet at one end and an outlet at the opposite end, a primary mixing structure near said primary air inlet, a secondary mixing structure spaced from said primary mixing structure but in line therewith, each of said mixing structures having a tubular body closed at one end except for a centrally positioned opening, said body at the other end having a radially extending flange extending to said cylinder, said auxiliary mixing structure having openings inits flange at the periphery thereof, and means for directing fluid fuel into the primary mixing structure.

RICHARD A. J. EVANS. 

